Debashish Sen

Comparative study on yield of Indian major carps in polythene lined rain water harvest tank at East Siang district of Arunachal Pradesh

Investigations were carried out to study the growth performance of Indian Major Carps viz. Rohu (Labeo rohita), Catla (Catla catla), Mrigala (Cirrhinus mrigala) and Chinese Carps viz. Grass Carp (Ctenopharyngodon idella), Common carp (Cyprinus carpio) and Silver carp (Hypophthalmichthys molitrix) in Polythene Lined rain water Harvest Tank. Rearing of the fishes using locally available feed materials Mustard Oil Cake and Rice Bran was conducted during 2013 to 2015 in Instructional farm of Krishi Vigyan Kendra East Siang, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh near district head quarters Pasighat (28°04′ N, 95°22′ E and 152 m altitude). The results revealed that better growth performance can be obtained by culturing Silver Carp and Grass Carp. The maximum weight of Silver carp and Grass carp was recorded upto 1.45 Kg and 1.14 kg respectively, after a culture period of 8 months.

Effect of essential oils on mortality, hatching and multiplication of root-knot nematode, Meloidogyne incognitaand its Impact on plant growth parameters

Essential oil from aromatic plants showed strong nematicidal activity in vitro experiments. Among six tested essential oils, percent juvenile mortality was observed in lemon grass (Cymbopogon citratus), 89, 51 as well as in palmarosa (Cymbopogon martini), 80 and 44 at the doses of 500 and 250 ppm respectively at 12 hour of exposure time. However, maximum mortality percentage was observed in C. citratus oil and it registered cent percent mortality at 500 ppm at 24 hours of exposure time. The hatching in both treatments started by 8th day and steeply increased in 10th day. Essential oils at 5 concentrations drastically reduced the total number of J2, as both essential oils showed more than 50% reduction in hatching over control. The minimum cumulative hatching was observed in 1000 ppm in C. citrates oil. The effect of root-dip treatments of tomato seedlings with C. citratus and C. martini significantly reduced total number of root knot galls/per plant, per cent galled area and soil population as compared to control. The minimum number of M. incognita galls was found in C. citratus at 500 ppm it was significantly different from carbosulfan as well as C. martini treatments. The maximum shoot length was found in C. martini followed by C. citratus and carbosulfan at 500 ppm. All the treatments significantly improved the root length than the inoculated plants but they were not significantly different among themselves.

Integrated Rizi-Pisciculture: An approach towards livelihood and nutritional security for the tribal community of East Siang district, Arunachal Pradesh

An approach was made to evaluate the feasibility and economic viability of rice fish culture (RFC) by conducting trials in 8 different villages viz. Ngorlung, Niglok, Balek, Mirem, Sikatode, Ayeng, Rayang and Seren of East Siang district, Arunachal Pradesh during Kharif seasons of 2011 to 2014. In the multilocational trials on rizi-pisciculture survival rate of advanced fry was recorded between 44.5% and 48.7% with an average weight of 83 g to 91 g at the harvest. During the study period average total cost of cultivation of RFC and sole cropping of rice was calculated to be ` 42, 700 and ` 26, 612 respectively. Average gross income and net income increased by ` 61, 937 and ` 44, 849 respectively by practicing RFC over the sole cropping of rice and it also raised the benefit-cost ratio of the system (2.61).